WO2020224536A1 - Dispositif et procédé intégrés de protection de gaz numérique de transformateur et de surveillance de surpression de flux d'huile - Google Patents

Dispositif et procédé intégrés de protection de gaz numérique de transformateur et de surveillance de surpression de flux d'huile Download PDF

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WO2020224536A1
WO2020224536A1 PCT/CN2020/088306 CN2020088306W WO2020224536A1 WO 2020224536 A1 WO2020224536 A1 WO 2020224536A1 CN 2020088306 W CN2020088306 W CN 2020088306W WO 2020224536 A1 WO2020224536 A1 WO 2020224536A1
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module
oil flow
digital
protection
transformer
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PCT/CN2020/088306
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Chinese (zh)
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闫晨光
朱述友
周贤
罗宝锋
张保会
高琰
徐雅
周贤武
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北京中瑞和电气有限公司
西安交通大学
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Publication of WO2020224536A1 publication Critical patent/WO2020224536A1/fr

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    • H02J13/0062—

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  • the invention belongs to the field of electric power systems, and relates to an integrated device and method for transformer digital gas protection and oil flow surge monitoring, and is used for reliably, quickly and sensitively identifying internal faults in the oil tank of an oil-immersed power transformer.
  • the transformer occupies a pivotal position in the power system. Its stable operation is an important prerequisite to ensure the reliable transmission, flexible distribution, and safe use of the entire power system.
  • the transformer body may be damaged due to the internal fault pressure impact, and even cause an explosion or fire accident; on the other hand, once the protection device is in a non-internal fault condition If there is a malfunction in the next stage, the economic loss caused by the power outage will be inevitable.
  • transformer protection With high reliability, fast action speed and high sensitivity.
  • the internal fault process of the transformer is accompanied by three main characteristics: phase current increase, differential current increase, and fault gas generation.
  • relay protection workers have designed over-current protection, differential protection, and non-electricity protection.
  • the subsequent changes in non-electric characteristics such as oil flow, temperature, and pressure in the transformer during the generation of faulty gas are the specific manifestations of the conversion of faulty electrical energy into internal energy, kinetic energy, potential energy and other forms of energy.
  • For weak internal faults of the transformer due to the small fault power, it is often difficult to distinguish sensitively only by power protection.
  • non-electricity characteristics such as oil flow surging, temperature rise, and pressure increase inside the transformer tank.
  • transformer protection is often more sensitive than electric quantity protection.
  • power transformers are expensive equipment that integrates windings, cores, insulation, fuel tanks, switches, coolers and other components.
  • the failure form is often manifested as overheating failures of various components: such as overheating between the core silicon steel sheets, burning of windings, melting or burns of tap changer contacts; or mechanical failures: loose core structure, mechanical deformation or collapse of windings, The transformer tank is cracked and leaking.
  • electrical quantity protection is often difficult to reliably distinguish, while non-electric quantity protection based on characteristics such as flow rate, temperature, and pressure can more comprehensively and directly reflect the fault status of the transformer.
  • the German transformer expert Max Buchholz invented the Buchholz relay and installed it on the connecting pipe between the transformer main tank and the oil pillow. It is mainly suitable for those with oil pillows and no gas space on the top of the tank.
  • Large-scale oil-immersed transformer to protect various types of internal faults outside the sensitive area of electrical energy protection, to make up for the shortcomings of electrical energy protection.
  • the gas protection device based on the generation of fault gas inside the transformer broadens the existing ideas of relay protection research, and is widely used in oil-immersed power transformers by virtue of its sensitivity advantages.
  • the oil-filled pressure regulating switch should be equipped with gas protection. When a slight gas or oil level drops in the shell, it should act on the signal instantaneously; when a large amount of gas is produced, it should act to open the circuit breakers on each side of the transformer.
  • relay protection is to screen the fault through the protection criterion after the fault occurs, and send a trip signal to quickly remove the fault, so as to avoid further damage to the system or equipment. Therefore, relay protection action to remove faults is a passive security defense method for power systems and power equipment. Unlike this, the online monitoring device of power equipment can monitor, analyze, and calculate the physical quantities that characterize the operating state of the transformer before a fault occurs, thereby assessing the health status of the equipment, thereby determining whether maintenance operations need to be scheduled, and preventing problems Yu Weiran's role in avoiding equipment failure is an active defense method to improve the safety of transformer operation.
  • the purpose of the present invention is to provide an integrated device and method for transformer digital gas protection and oil flow surge monitoring, which can reliably, quickly and sensitively identify internal faults in the oil tank of an oil-immersed power transformer, and through the monitoring and analysis of transient oil flow In order to evaluate the operating status of the transformer, the integration of protection and online monitoring can be realized.
  • Transformer digital gas protection and oil flow surge monitoring integrated device including: transient oil flow characteristic quantity measurement module, switch input module, signal conditioning and acquisition module and digital core module; among them, transient oil flow characteristic quantity measurement
  • the module is connected with the signal conditioning and acquisition module, and the signal conditioning and acquisition module, switch output module, external communication interface module, man-machine dialogue module, switch output module and data storage module are all connected with the digital core module;
  • the transient oil flow characteristic quantity measurement module is used for real-time and high-speed measurement of the transient oil flow change characteristics inside the transformer oil conservator connection pipe, and output the corresponding analog voltage/current signal;
  • the signal conditioning and acquisition module is used to receive the analog voltage/current signal obtained by the transient oil flow characteristic measurement module, and convert it into a standard digital signal that the digital core module can recognize, and then output the standard digital signal;
  • the switch input module is used to collect the relevant switch signals that need to be ascertained, and output them as high level 1 or low level 0 as the input digital quantity of the digital core module;
  • the digital core module is used to perform protection and monitoring operations after receiving standard digital signals and input digital quantities, complete digital signal processing tasks, and realize the integrated functions of relay protection and online monitoring.
  • a further improvement of the present invention is that the transient oil flow characteristic quantity measurement module is composed of an externally bundled high-frequency ultrasonic flowmeter, a flowmeter transmitter and a communication cable, and the externally bundled high-frequency ultrasonic flowmeter is installed in the transformer oil pillow connection On the pipe, the externally bundled high-frequency ultrasonic flowmeter is connected with the flowmeter transmitter, and the flowmeter transmitter is connected with the communication cable.
  • the further improvement of the present invention is that the measurement frequency of the externally bundled high-frequency ultrasonic flowmeter is above 100 Hz, the measurement error is less than 1%, the working temperature is -30 to 80°C, and the flow rate range is -20 to 20 m/s.
  • the signal conditioning and acquisition module is composed of wiring terminals, a signal conditioning circuit, a low-pass filter, a signal sampling circuit, and an analog-to-digital A/D conversion circuit; the wiring terminals are connected to the signal conditioning circuit, and the signal conditioning circuit is connected to the signal conditioning circuit.
  • the low-pass filter is connected, the low-pass filter is connected to the signal sampling circuit, the signal sampling circuit is connected to the analog-to-digital A/D conversion circuit, and the analog-to-digital A/D conversion circuit is connected to the digital core module; the terminal block is also connected to the communication cable .
  • the digital core module is composed of a bus, a central processing unit, a timer/counter, a random access memory, and a control circuit;
  • the bus includes a data bus, an address bus and a control bus to realize data exchange and operation control;
  • the central processing unit Use single-chip microprocessor, general-purpose microprocessor or digital signal processor to realize digital signal processing;
  • timer/counter is used to provide timing sampling trigger signal, form interruption, protection delay action timing function;
  • random access memory is used to temporarily store temporary Data includes the data information input by the signal conditioning and acquisition module, and the intermediate results of the calculation process;
  • the control circuit realizes the connection and coordination of the entire digital circuit through a complex programmable logic device or a field programmable gate array.
  • a further improvement of the present invention is that it also includes an external communication interface module, a man-machine dialogue module, a switch output module and a data storage module connected to the digital core module;
  • the external communication interface module is used to provide an information channel with a computer communication network and a remote communication network to realize information interaction, data sharing, remote operation and remote maintenance functions;
  • the man-machine dialogue module is used to establish the information connection between the digital protection device and the user, so that the operator can manually operate and debug the protection device and obtain information feedback;
  • the switch output module is used to output the 0 or 1 state to control the on or off of the trip circuit and alarm circuit;
  • the data storage module is used to store data.
  • the external communication interface module includes an IEC 61850 communication interface and a dedicated communication interface for protection functions;
  • the man-machine dialogue module includes a compact keyboard, display, indicator lights, buttons and printer interface;
  • the switch output module is composed of a photoelectric isolation device and an export relay. One end of the photoelectric isolation device is connected to the digital core module, and the other end is connected to the export relay;
  • the data storage module is composed of a main flash memory and a secondary flash memory; the primary and secondary flash memories are used as the main memory and backup memory of the device.
  • a method based on the above-mentioned integrated device for transformer digital gas protection and oil flow surge monitoring includes the following steps:
  • the transient oil flow characteristic quantity measurement module measures the transient oil flow change characteristics inside the transformer oil conservator connection pipe in real time; outputs the corresponding analog voltage/current signal;
  • the signal conditioning and acquisition module receives the analog voltage/current signal obtained by the transient oil flow characteristic measurement module, converts it into a standard digital signal that can be recognized by the digital core module, and then outputs the standard digital signal;
  • the switch input module is used to collect the relevant switch signals that need to be ascertained, and output them as high level 1 or low level 0 as the input digital quantity of the digital core module;
  • the digital core module uses formula (1) to calculate the oil flow action quantity v op (t) at the current time t:
  • T is the length of the data window
  • f is the signal sampling frequency of the acquisition module
  • k re is the protection reliability coefficient
  • v th.1 is the digital gas protection threshold
  • step 5 Determine the size of the operating oil flow v op (t) and the over-current alarm threshold v th.2 . If the operating oil flow is greater than or equal to the over-current alarm threshold v th.2 , that is, equation (4) is established, a transformer over-current warning will be issued , Go to step 7; if the operating oil flow is less than the overcurrent alarm threshold v th.2 , that is, formula (4) is not established, go to step 6;
  • step 8 Perform running self-check in running state, if no device failure is found, return to step 1, re-read the oil flow data velocity v ms (t+1) at the next moment; if a device failure is found, an alarm signal will be issued and the entire device will be locked , Wait for the technician to troubleshoot and reset manually.
  • a further improvement of the present invention is that in formula (2), the starting threshold v st is 0.5 to 0.6 m/s;
  • the protection reliability coefficient k re is 1.2.
  • step 5 the overcurrent alarm threshold v th.2 is 0.4-0.5m /s;
  • step 6 the quasi-overcurrent warning threshold v th.3 is 0.3 to 0.4 m/s.
  • the present invention has the following beneficial effects:
  • the present invention uses digital oil flow information to form protection to identify transformer internal faults. Compared with the previous mechanical gas protection and current differential protection, it has the following advantages: First, although the transformer internal, external, and disturbance conditions will cause a certain amplitude However, due to the essential difference in the mechanism of the oil flow surging, the digital oil flow information can be used to distinguish the different operating states of the transformer. Second, the present invention uses an externally bundled high-frequency ultrasonic flowmeter to realize digital real-time measurement of the oil flow inside the oil confinement connecting pipe without damaging the existing structural integrity of the transformer. Different from the spring structure of traditional mechanical Buchholz relay soaked in insulating oil for a long time, the ultrasonic flowmeter does not directly contact the insulating oil.
  • the indirect measurement method will not cause the loss of the kinetic energy of the flow rate; And the sludge generated by the deterioration of the insulating oil will not adhere to the measuring device, so the device of the present invention has higher flow velocity measurement accuracy, sensing sensitivity, and long-term operation reliability and stability.
  • the common advantage of non-electricity protection is that it is more sensitive to weak faults. From the perspective of energy conversion, electrical network failures will accompany the conversion of faulty electrical energy, while non-electrical physical quantities are often direct representations of different forms of energy, and at the same time have cumulative effects in nature.
  • the present invention overcomes the traditional mechanical non-electricity protection. Although tens of thousands of oil-immersed transformers have been successfully protected in the course of nearly a hundred years of use, but due to theoretical modeling difficulties, principle defects, threshold values based on experience, and mechanical Problems such as insufficient structural performance are increasingly difficult to meet the higher requirements of current large-capacity, high-voltage power transformers. At the same time, system power outages and transformer explosion accidents caused by protection refusal and misoperation accidents occur from time to time, which seriously affect the safe and reliable operation of the power system, and seriously threaten the life and property safety of substation operators and the surrounding people.
  • the present invention adopts a high-frequency ultrasonic flowmeter to realize real-time measurement of the oil flow inside the oil pillow connecting pipe without damaging the existing structural integrity of the transformer.
  • the on-line monitoring integrated device of the present invention is independent of the power network, the measurement of oil flow characteristics and signal transmission suffer less interference, and it does not inject harmonics into the power system; the data acquisition components and the oil flow calculation analysis components can fully meet the requirements of fast, Real-time processing of multi-channel, high-frequency data requirements.
  • the present invention uses a flow meter with a measurement frequency of 100 Hz or more, a measurement error of less than 1%, a working temperature of -30 to 80°C, and a flow rate range of -20 to 20 m/s for measurement.
  • the meter can realize real-time measurement of the oil flow velocity without destroying the structural integrity of the transformer oil pillow connecting pipe.
  • the high-frequency ultrasonic flowmeter can meet the high temperature and strong electromagnetic environment requirements of the power transformer body in terms of accuracy and range of use. .
  • the device of the present invention is composed of a transient oil flow characteristic quantity measurement module, a switch input module, a signal conditioning and acquisition module, and a digital core module.
  • the online monitoring integrated device is controlled to realize the protection of the protection device.
  • the invention uses the transient change characteristics of the oil flow inside the oil pillow connection pipe and the difference in flow velocity under different operating conditions to screen the internal faults of the transformer oil tank, and improves the mechanical gas protection based on experience and feeling to quantitative analysis and high reliability.
  • the new stage of performance determination and digitization will adapt to the current and future requirements of large-capacity, high-voltage power transformers for the "four characteristics" of gas protection.
  • the invention overcomes the problem that the traditional Buchholz relay can only sense the flow rate through a mechanical spring device and can only output switch information. A single flow rate amplitude often cannot correctly distinguish the internal and external faults of the transformer, resulting in protection malfunction or refusal to operate. .
  • the invention obtains the action oil flow that can completely characterize the average kinetic energy of the transformer oil flow through filtering and integral calculation of the transient oil flow data inside the transformer oil pillow connecting pipe, and the preset start threshold, overcurrent alarm threshold and quasi-overcurrent The alarm threshold is compared to realize real-time monitoring and evaluation of the oil flow level inside the transformer.
  • the present invention organically combines online monitoring and relay protection functions.
  • the application of the present invention has important engineering practicality for transformer operators to obtain real-time, accurate and reliable transformer transient oil flow data, evaluate transformer operation status, and improve transformer safety operation level. significance.
  • Figure 1 is a schematic diagram of the structure of the present invention.
  • Figure 2 is a logic flow diagram of the present invention.
  • Figure 3 shows the field test verification results of the digital gas protection device for power transformers.
  • the integrated device for transformer digital gas protection and oil flow surge monitoring including: transient oil flow characteristic measurement module, switch input module, signal conditioning and acquisition module, digital core module, external communication interface module, Man-machine dialogue module, switch output module and data storage module.
  • the transient oil flow characteristic quantity measurement module is connected with the signal conditioning and acquisition module.
  • the signal conditioning and acquisition module, the switch output module, the external communication interface module, the man-machine dialogue module, the switch output module and the data storage module are all connected with the digital Core modules are connected;
  • the transient oil flow characteristic quantity measurement module is composed of an externally bundled high-frequency ultrasonic flowmeter, a flowmeter transmitter and a communication cable.
  • the externally bundled high-frequency ultrasonic flowmeter is installed on the connecting pipe of the transformer oil pillow.
  • the high-frequency ultrasonic flowmeter is connected with the flowmeter transmitter, and the flowmeter transmitter is connected with the communication cable.
  • the externally bundled high-frequency ultrasonic flowmeter is used to measure the characteristics of the transient oil flow changes in the transformer oil pillow connecting pipe in real time and high speed, and the flowmeter transmitter and the communication cable are used to output the corresponding analog voltage/current signal.
  • the measurement frequency of the high-frequency ultrasonic flowmeter must be above 100Hz, the measurement error must be less than 1%, the operating temperature must reach -30 ⁇ 80°C, and the flow rate range must reach -20 ⁇ 20m/s.
  • the switch input module collects the relevant switch signals that need to be known, and outputs them as high level “1” or low level “0" through the photoelectric isolation device, as the input digital quantity of the digital core module.
  • the signal conditioning and acquisition module is composed of wiring terminals, signal conditioning circuits, low-pass filters, signal sampling circuits and analog-to-digital (A/D) conversion circuits.
  • the connection terminal is connected to the signal conditioning circuit, the signal conditioning circuit is connected to the low-pass filter, the low-pass filter is connected to the signal sampling circuit, and the signal sampling circuit is connected to the analog-to-digital A/D conversion circuit; the connection terminal is also connected to the communication cable,
  • the analog-to-digital A/D conversion circuit is connected to the digital core module.
  • the signal conditioning and acquisition module is used to receive the analog voltage/current signal obtained by the transient oil flow characteristic measurement module and convert it into a standard digital signal that the digital core module can recognize.
  • the digital core module is used to receive the standard digital signal output by the signal conditioning and acquisition module and the input digital value output by the switch input module, perform protection and monitoring operations, complete digital signal processing tasks, and realize the integrated function of relay protection and online monitoring .
  • the digital core module is composed of bus, central processing unit (CPU), timer/counter, random access memory (RAM), read-only memory (ROM) and control circuit.
  • the bus includes a data bus, an address bus, and a control bus to realize data exchange and operation control.
  • the central processing unit (CPU) is the command center of the digital core module. It can use single-chip microprocessors, general-purpose microprocessors, and digital signal processors (DSP) to quickly realize digital signal processing in real time.
  • the timer/counter is used to provide functions such as timing sampling trigger signal, forming interrupt, and precise timing of protection delay action.
  • Random Access Memory (RAM) is used to temporarily store a large amount of temporary data that needs to be exchanged quickly, including data information input by signal conditioning and acquisition modules, and intermediate results of calculation processing.
  • Read-only memory is used to store data.
  • the control circuit can realize the effective connection and coordination of the entire digital circuit through a complex programmable logic device (CPLD) or a field programmable gate array (FPGA).
  • CPLD complex programmable logic device
  • FPGA field programmable gate array
  • the digital core module is used to realize data exchange and operation control, complete digital signal processing tasks, direct the normal operation of connected modules, and realize the integrated functions of relay protection and online monitoring.
  • the external communication interface module is composed of an IEC 61850 communication interface and a dedicated communication interface for protection functions. It is used to provide information channels with computer communication networks and remote communication networks to realize functions such as information exchange, data sharing, remote operation and remote maintenance.
  • the man-machine dialogue module includes compact keyboard, display screen, indicator light, printer interface and debugging communication interface. It is used to establish the information connection between the digital protection device and the user, so that the operator can manually operate the protection device, debug and get information feedback.
  • the switch output module is composed of a photoelectric isolation device and an outlet relay. It controls the “on” or “off” of the trip circuit and the alarm circuit through the output "0" or “1” state, so as to realize the reliable action of the protection.
  • the data storage module is composed of primary and secondary flash memory (Flash Memory). Flash memory is used for data storage, as the main memory and backup memory of the online monitoring system.
  • transformer digital gas protection and oil flow surge monitoring integrated device is as follows:
  • the transient oil flow characteristic quantity measurement module measures the characteristics of the transient oil flow changes in the oil conservator connection pipe of the transformer in real time and at a high speed, that is, reads the current oil conservator connection pipe oil flow data v ms (t); output the corresponding analog voltage/current signal;
  • the signal conditioning and acquisition module receives the analog voltage/current signal obtained by the transient oil flow characteristic measurement module, converts it into a standard digital signal that can be recognized by the digital core module, and then outputs the standard digital signal;
  • the switch input module is used to collect the relevant switch signals that need to be ascertained, and output them as high level 1 or low level 0 as the input digital quantity of the digital core module;
  • the digital core module After receiving the standard digital signal and the input digital quantity, the digital core module uses formula (1) to calculate the oil flow movement quantity v op (t) at the current time t.
  • T is the length of the data window.
  • f is the signal sampling frequency of the acquisition module.
  • the starting threshold v st can be selected within the flow rate range of 0.5 to 0.6 m/s according to the diameter of the oil conservator connecting pipe.
  • k re is the protection reliability coefficient, usually 1.2.
  • v th.1 is the threshold value of digital gas protection, which can be selected according to the pipe diameter of the oil conservator connecting pipe with reference to the national or industry standards for heavy gas protection of mechanical Buchholz relays.
  • v th.2 7Judging the magnitude of the operating oil flow v op (t) and the overcurrent alarm threshold v th.2 , v th.2 can usually be set to 0.4 ⁇ 0.5m/s.
  • the overcurrent alarm threshold v th.2 is based on The pipe diameter size of the oil pillow connecting pipe is selected within the flow rate range of 0.4 ⁇ 0.5m/s. If the operating oil flow is greater than or equal to the over-current alarm threshold v th.2 , that is, equation (4) is established, an over-current warning of the transformer is issued; if the operating oil flow is less than the over-current alarm threshold v th.2 , that is, equation (4) is not established, Then enter step 8.
  • V th.3 can usually be set to 0.3 ⁇ 0.4m/s.
  • the quasi-overcurrent warning threshold v th. 3 According to the pipe diameter size of the oil pillow connecting pipe, select within the flow rate range of 0.3 ⁇ 0.4m/s. If it is greater than or equal to the quasi-overcurrent warning threshold, that is, formula (5) is established, a transformer quasi-overcurrent warning is issued; if it is less than the quasi-overcurrent warning threshold v th.3 , that is, formula (5) is not established, it indicates that the transformer oil flow velocity is normal .
  • step 10 Carry out running self-check and self-check on the running status. If no device failure is found, return to step 3, re-read the oil flow data velocity v ms (t+1) at the next moment; if a device failure is found, an alarm signal will be issued and Lock the entire device and wait for technicians to troubleshoot and reset manually.
  • the invention can realize the functions of system monitoring, fault processing, man-machine dialogue, communication, self-inspection, accident recording and analysis report and debugging of the device.
  • the invention realizes the real-time measurement of the oil flow inside the oil pillow connecting pipe through the external clamp type high frequency ultrasonic flowmeter without destroying the existing structural integrity of the transformer.
  • the clamp-on high-frequency ultrasonic flowmeter is independent of the power network, and the measurement of oil flow characteristics and signal transmission suffers less interference, and it does not inject harmonics into the power system; data acquisition components and oil flow calculation and analysis components can fully meet the requirements of fast, Real-time processing of multi-channel, high-frequency data requirements.
  • the present invention adopts an externally bundled high frequency ultrasonic flowmeter with a measurement frequency of 100 Hz or more, a measurement error of less than 1%, a working temperature of -30 to 80°C, and a flow rate range of -20 to 20 m/s.
  • the high-frequency ultrasonic flowmeter can meet the requirements of high temperature, oil pollution and strong electromagnetic environment inside the power transformer in terms of accuracy and range of use.
  • the action oil flow that can completely characterize the average kinetic energy of the transformer oil flow is obtained, and the preset start threshold, overcurrent alarm threshold and pass The flow alarm threshold is compared to realize real-time monitoring and evaluation of the oil flow level inside the transformer.
  • the present invention uses the transient change characteristics of the oil flow inside the oil pillow connecting pipe and the difference in flow velocity under different operating conditions to screen the internal faults of the transformer oil tank, and improves the mechanical gas protection based on experience and feeling to quantitative analysis,
  • the new stage of high-reliability determination and digitization so as to adapt to the current and future large-capacity, high-voltage power transformers' "four characteristics" requirements for gas protection, there are no relevant studies, reports and products at home or abroad.
  • the SFSZ8-40000/110 three-phase three-winding transformer was used as a test platform to conduct field tests to illustrate the effect of the present invention.
  • the main geometric structure and nameplate parameters of this type of transformer are shown in Table 1.
  • Figure 3 when the transformer is in normal operation (t ⁇ 0ms), the oil flow velocity inside the transformer oil pillow connecting pipe does not change significantly. At this time, the operating oil flow v op measured and calculated by this device is less than the protection start threshold v st , so the protection function is not activated.
  • the device of the present invention since the operating oil flow v op is less than the over-current and quasi-over-current threshold values v th.2 and v th.3 , the device of the present invention does not issue an over-current alarm, and externally shows that the oil flow velocity inside the transformer oil pillow connecting pipe is normal.
  • the oil flow action volume v op obtained by the device of the present invention measured and calculated is greater than the protection preset action threshold value v th.1 .
  • the device determines that the transformer has an internal fault and sends a trip signal to remove the faulty transformer.
  • the field test results show that the device of the present invention can capture the sudden change of oil flow in the oil confinement connecting pipe of an oil-immersed power transformer in a very short time, and obtain the oil flow action quantity that can characterize the swell intensity of the oil flow inside the transformer by calculation. , According to the comparison with the preset protection criterion, the internal arc fault of the transformer is correctly screened, and the fault is removed reliably, sensitively and quickly.
  • Table 1 The main geometric structure and nameplate parameters of SFSZ8-40000/110 transformer

Abstract

La présente invention concerne un dispositif et un procédé intégrés de protection de gaz numérique de transformateur et de surveillance de surpression de flux d'huile. Le dispositif comprend : un module de mesure de quantité caractéristique de flux d'huile transitoire, un module d'entrée de valeur de commutation, un module de conditionnement et d'acquisition de signal et un module de noyau numérique, le module de mesure de quantité caractéristique de flux d'huile transitoire étant connecté au module de conditionnement et d'acquisition de signal, et le module de conditionnement et d'acquisition de signal et un module de sortie de valeur de commutation étant connectés au module de noyau numérique.
PCT/CN2020/088306 2019-05-07 2020-04-30 Dispositif et procédé intégrés de protection de gaz numérique de transformateur et de surveillance de surpression de flux d'huile WO2020224536A1 (fr)

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CN110086257B (zh) * 2019-05-07 2020-10-27 西安交通大学 变压器数字式瓦斯保护与油流涌动监测一体化装置及方法
CN112630643B (zh) * 2020-12-14 2023-04-28 国网经济技术研究院有限公司 换流变有载调压开关顶盖状态监测装置及方法
CN114002624B (zh) * 2020-12-31 2023-07-04 杭州柯林电气股份有限公司 电力物联网网络攻击抵御系统及其控制方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101551440A (zh) * 2009-05-15 2009-10-07 东北大学 一种发电机变压器组故障录波分析装置
CN102810843A (zh) * 2011-06-02 2012-12-05 北京纳森新能源技术有限公司 风机箱式变压器保护测控装置
CN102981084A (zh) * 2012-12-07 2013-03-20 深圳市双合电气股份有限公司 一种电力系统变压器综合监控系统
CN104362736A (zh) * 2014-09-17 2015-02-18 特变电工衡阳变压器有限公司 一种智能组件柜及其用于智能变压器的监测方法
CN204241498U (zh) * 2014-05-28 2015-04-01 国网山西省电力公司电力科学研究院 变压器油流流速的监测装置
CN110071481A (zh) * 2019-05-07 2019-07-30 北京中瑞和电气有限公司 一种电力变压器数字式瓦斯保护装置及方法
CN110086257A (zh) * 2019-05-07 2019-08-02 西安交通大学 变压器数字式瓦斯保护与油流涌动监测一体化装置及方法

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105301281A (zh) * 2014-05-28 2016-02-03 国网山西省电力公司电力科学研究院 变压器油流流速的监测方法及监测装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101551440A (zh) * 2009-05-15 2009-10-07 东北大学 一种发电机变压器组故障录波分析装置
CN102810843A (zh) * 2011-06-02 2012-12-05 北京纳森新能源技术有限公司 风机箱式变压器保护测控装置
CN102981084A (zh) * 2012-12-07 2013-03-20 深圳市双合电气股份有限公司 一种电力系统变压器综合监控系统
CN204241498U (zh) * 2014-05-28 2015-04-01 国网山西省电力公司电力科学研究院 变压器油流流速的监测装置
CN104362736A (zh) * 2014-09-17 2015-02-18 特变电工衡阳变压器有限公司 一种智能组件柜及其用于智能变压器的监测方法
CN110071481A (zh) * 2019-05-07 2019-07-30 北京中瑞和电气有限公司 一种电力变压器数字式瓦斯保护装置及方法
CN110086257A (zh) * 2019-05-07 2019-08-02 西安交通大学 变压器数字式瓦斯保护与油流涌动监测一体化装置及方法

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